/*
 * Copyright 2010 Emmanuel Astier & Kevin Gaudin
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.sny.mailfeedback;

import android.util.Log;

import org.apache.http.conn.ssl.AllowAllHostnameVerifier;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Iterator;
import java.util.Map;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.KeyManager;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;

/**
 * 利用Https/Http来发放Post的数据
 */
class HttpUtils {

    private static final String LOG_TAG = CrashReport.LOG_TAG;

    private static final TrustManager[] TRUST_MANAGER = {new NaiveTrustManager()};

    private static final AllowAllHostnameVerifier HOSTNAME_VERIFIER = new AllowAllHostnameVerifier();

    private static final int SOCKET_TIMEOUT = 3000;

    /**
     * Send an HTTP(s) request with POST parameters.
     * 
     * @param parameters
     * @param url
     * @throws UnsupportedEncodingException
     * @throws IOException
     * @throws KeyManagementException
     * @throws NoSuchAlgorithmException
     */
    static void doPost(Map<?, ?> parameters, URL url)
            throws UnsupportedEncodingException, IOException, KeyManagementException, NoSuchAlgorithmException {

        URLConnection cnx = getConnection(url);

        // Construct data
        StringBuilder dataBfr = new StringBuilder();
        Iterator<?> iKeys = parameters.keySet().iterator();
        while (iKeys.hasNext()) {
            if (dataBfr.length() != 0) {
                dataBfr.append('&');
            }
            String key = (String) iKeys.next();
            dataBfr.append(URLEncoder.encode(key, "UTF-8")).append('=')
                    .append(URLEncoder.encode((String) parameters.get(key), "UTF-8"));
        }
        // POST data
        cnx.setDoOutput(true);

        OutputStreamWriter wr = new OutputStreamWriter(cnx.getOutputStream());
        Log.d(LOG_TAG, "Posting crash report data");
        wr.write(dataBfr.toString());
        wr.flush();
        wr.close();

        Log.d(LOG_TAG, "Reading response");
        BufferedReader rd = new BufferedReader(new InputStreamReader(cnx.getInputStream()));

        String line;
        while ((line = rd.readLine()) != null) {
            Log.d(LOG_TAG, line);
        }
        rd.close();
    }

    /**
     * Open an URL connection. If HTTPS, accepts any certificate even if not valid, and connects to
     * any host name.
     * 
     * @param url The destination URL, HTTP or HTTPS.
     * @return The URLConnection.
     * @throws IOException
     * @throws NoSuchAlgorithmException
     * @throws KeyManagementException
     */
    private static URLConnection getConnection(URL url) throws IOException, NoSuchAlgorithmException, KeyManagementException {

        URLConnection conn = url.openConnection();
        if (conn instanceof HttpsURLConnection) {
            // Trust all certificates
            SSLContext context = SSLContext.getInstance("TLS");
            context.init(new KeyManager[0], TRUST_MANAGER, new SecureRandom());
            SSLSocketFactory socketFactory = context.getSocketFactory();
            ((HttpsURLConnection) conn).setSSLSocketFactory(socketFactory);
            // Allow all hostnames
            ((HttpsURLConnection) conn).setHostnameVerifier(HOSTNAME_VERIFIER);

        }
        conn.setConnectTimeout(SOCKET_TIMEOUT);
        conn.setReadTimeout(SOCKET_TIMEOUT);
        return conn;
    }

}
